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J/A+A/520/A15       RACE-OC project: YSOs within 100pc       (Messina+, 2010)

RACE-OC project: Rotation and variability of young stellar associations within 100pc. Messina S., Desidera S., Tutatto M., Lanzafame A.C., Guinan E.F. <Astron. Astrophys. 520, A15 (2010)> =2010A&A...520A..15M
ADC_Keywords: Clusters, open ; Stars, late-type ; Stars, variable Keywords: stars: activity - stars: late-type - stars: rotation - starspots - open clusters and associations: general - stars: pre-main sequence Abstract: Examining the angular momentum of stars and its interplay with their magnetic fields represent a promising way to probe the stellar internal structure and evolution of low-mass stars. We attempt to determine the rotational and magnetic-related activity properties of stars at different stages of evolution.We focused our attention primarily on members of clusters and young stellar associations of known ages. In this study, our targets are 6 young loose stellar associations within 100pc and with ages in the range 8-70Myr: TW Hydrae (∼8Myr), beta Pictoris (∼10Myr), Tucana/Horologium, Columba, Carina (∼30Myr), and AB Doradus (∼70Myr). Additional rotational data for alpha Persei and the Pleiades from the literature are also considered. Description: Rotational periods of stars exhibiting rotational modulation due to photospheric magnetic activity (i.e., starspots) were determined by applying the Lomb-Scargle periodogram technique to photometric time-series data obtained by the All Sky Automated Survey (ASAS). The magnetic activity level was derived from the amplitude of the V lightcurves. The statistical significance of the rotational evolution at different ages was inferred by applying a two-sided Kolmogorov-Smirnov test to subsequent age-bins. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file periods.dat 132 204 Summary of rotation periods (tables 3-8 of the paper) tablea.dat 119 147 Summary of parameters for the 6 associations (tables A1-A6 of the paper) tablea7.dat 83 918 Summary of periods in individual segments
See also: J/A+A/483/253 : RACE-OC project: NGC 2099 variables BV phot. (Messina+, 2008) J/A+A/513/A29 : RACE-OC project: M11 (NGC6705) (Messina+, 2010) II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005) Byte-by-byte Description of file: periods.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Target Target name 17- 29 A13 --- ASAS ASAS ID number (HHMMSS+DDMM.m) 31- 39 F9.6 d Per ? Rotation period 41- 48 F8.6 d e_Per ? Error on Per 50- 51 I2 --- Nper ? Number of period detection 52 A1 --- --- [/] 53- 54 I2 --- Ntot ? Total number of time segments 56- 59 F4.2 mag Vamp ? V-band light curve amplitude 61- 65 F5.3 mag Vsig ? Photometric precision 67- 71 F5.2 mag Vmag ? V brightest magnitude 73- 76 F4.2 mag B-V ? B-V color index 78- 84 A7 --- SpType MK spectral type 85- 89 A5 --- bin Multiplicity code (1) 91-109 A19 --- n_Per Note on period (2) 110-118 A9 --- VarName Variable's name 120-125 A6 --- Note Note (3) 126-132 A7 --- MGR Membership to association (G1)
Note (1): Multiplicity code as follows: V = visual companion S = single star B = binary system T = triple system Q = quadruple system EB = Eclipsing binary SB = Spectrsocopic binary Note (2): Abbreviations used in the notes: Plit = period as given in the literature PACVS = period in ACVS (ASAS catalog of variable stars) Note (3): Notes as follows: a = rejected member and excluded from rotation period distribution b = period undetected in the periodogram of the complete timeseries c = vsini inconsistent with veq=2πR/P d = tidally-locked binary system e = not included in the member list because of incomplete kinematic information f = inferred from spectral type
Byte-by-byte Description of file: tablea.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Assoc Association code (G1) 9- 23 A15 --- Target Target's name 25- 39 A15 --- OName Target's other name 41- 42 I2 h RAh Right ascension (J2000.0) 44- 45 I2 min RAm Right ascension (J2000.0) 47- 51 F5.2 s RAs Right ascension (J2000.0) 53 A1 --- DE- Declination sign (J2000.0) 54- 55 I2 deg DEd Declination (J2000.0) 57- 58 I2 arcmin DEm Declination (J2000.0) 60- 64 F5.2 arcsec DEs Declination (J2000.0) 65 A1 --- n_Pos [*] Position corrected by CDS 66- 70 F5.2 mag Vmag Johnson V magnitude 72- 75 F4.2 mag B-V Johnson B-V colour index 77- 80 F4.2 mag V-Ic Johnson-Cousins V-I colour index 82- 86 F5.2 mag VMAG Absolute V magnitude 88- 93 F6.2 pc Dist Heliocentric distance 95-100 F6.2 km/s vsini ?=- Projected equatorial velocity 102-104 F3.1 solMass Mass ?=- Derived stellar mass 106-108 F3.1 solRad Rad ?=- Derived stellar radius 110-115 A6 --- SpType MK spectral type 117 A1 --- n_Mm [ab] Individual note on membership (2) 119 A1 --- Mm [mn] membership code, m=confirmed member
Note (2): Notes as follows: a = TYC 5882 1169 1: although previously classified as a member of the Tuc/Hor association, it is proposed by Torres et al. (2008, ASP Monograph Publications, 5, 757, [arXiv:0808.3362]) as high-probability member of Columba association. b = HIP 32235: and HIP 33737 are members of Tuc/Hor according to Zuckerman & Song (2004ARA&A..42..685Z). In the present study, they are assumed to be members of Carina according to Torres et al. (2008, ASP Monograph Publications, 5, 757, [arXiv:0808.3362]).
Byte-by-byte Description of file: tablea7.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Target Target's name 18- 30 A13 --- ASAS ASAS number (HHMMSS+DDMM.m) 32- 43 F12.4 d MJD.ini Initial Modified Julian date 45- 56 F12.4 d MJD.fin Final Modified Julian date 58- 64 F7.4 d Per Rotation period 66- 71 F6.4 d e_Per Uncertainty on Per 73- 77 F5.2 --- PN ?=- Normalized power (1) 79- 83 F5.2 --- Fap Power at 99% confidence level (1)
Note (1): power PN(ω) in the Lomb-Scargle periodogram technique for the angular frequency ω corresponding to the period.
Global Notes: Note (G1): The association names are: TWA = TW Hydrae (table A1) BPIC = β Pictoris (table A2) TUC/HOR = Tucana/Horologium (table A3) COL = Columba (table A4) CAR = Carina (table A5) ABDOR = AB Doradus (table A6)
History: * 15-Nov-2010: On-line version * 13-Feb-2012: position of TYC 1355-214-1 corrected Acknowledgements: Sergio Messina, sme(at)oact.inaf.it
(End) Patricia Vannier [CDS] 12-Nov-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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